I found a reference to that error. It appears to come from the VisualChooser module of OpenSceneGraph. You can see the error message in the source code here:
http://www.openscenegraph.org/projec...ualChooser.cpp
It also appears in this document:
http://archive.netbsd.se/?ml=opensce...6-07&t=2179192
which implies that the graphics card is too old, but I would think a Radeon 9500 would be relatively recent and support the "WGL Extensions" mentioned.
Any ideas?